Re: vinum in 4.x poor performer?

From: Marc G. Fournier (scrappy_at_hub.org)
Date: 02/09/05

  • Next message: Loren M. Lang: "Re: favor" 
    Date: Wed, 9 Feb 2005 01:32:31 -0400 (AST)
To: Dan Nelson <dnelson@allantgroup.com>

    On Tue, 8 Feb 2005, Dan Nelson wrote:

    > Details on the array's performance, I think. Software RAID5 will
    > definitely have poor write performance (logging disks solve that
    > problem but vinum doesn't do that), but should have excellent read
    > rates. From this output, however:
    >
    >> systat -v output help:
    >> 4 users Load 4.64 5.58 5.77
    >
    >> Proc:r p d s w Csw Trp Sys Int Sof Flt
    >> 24 9282 949 8414***** 678 349 8198
    >
    >> 54.6%Sys 0.2%Intr 45.2%User 0.0%Nice 0.0%Idl
    >
    >> Disks da0 da1 da2 da3 da4 pass0 pass1
    >> KB/t 5.32 9.50 12.52 16.00 9.00 0.00 0.00
    >> tps 23 2 4 3 1 0 0
    >> MB/s 0.12 0.01 0.05 0.04 0.01 0.00 0.00
    >> % busy 3 1 1 1 0 0 0
    >
    > , it looks like your disks aren't being touched at all. You are doing
    > over 99999 syscalls/second, though, which is mighty high. The 50% Sys
    > doesn't look good either. You may have a runaway process doing some
    > syscall over and over. If this is not an MPSAFE syscall (see
    > /sys/kern/syscalls.master ), it will also prevent other processes from
    > making non-MPSAFE syscalls, and in 4.x that's most of them.

    Wow, that actually pointed me in the right direction, I think ... I just
    killed an http process that was using alot of CPU, and syscalls drop'd
    down to a numeric value again ... I'm still curious as to why this only
    seem sto affect my Dual-Xeon box though :(

    Thanks ... 

    ----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664
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  • Next message: Loren M. Lang: "Re: favor"

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